Act as a senior UX designer designing a hospital-grade patient portal system. Create a complete UX architecture and user flow for a patient web portal that includes: Appointments, Visits (OPD/IPD), PHR, Medications, Lab Reports, Messaging, and Billing. Show end-to-end patient journey Define relationships between modules Include system-generated events (e.g., records auto-created after consultation) Include user actions and system responses Include edge cases and alternative flows For each module: Define entry point Define key screens Define transitions between screens Output format: High-level architecture Detailed user flow (step-by-step) Screen breakdown (with purpose of each screen) UX best practices for healthcare systems according to real world application for patient portal and it should be good ux flow and understanding